Enzymes are associated with the biochemical pathways of cellular respiration and photosynthesis - VCE - SSCE Biology - Question 19 - 2022 - Paper 1
Question 19
Enzymes are associated with the biochemical pathways of cellular respiration and photosynthesis.
Consider a cell that carries out both cellular respiration and phot... show full transcript
Worked Solution & Example Answer:Enzymes are associated with the biochemical pathways of cellular respiration and photosynthesis - VCE - SSCE Biology - Question 19 - 2022 - Paper 1
Step 1
A. Both pathways are catalysed by the same enzymes.
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Answer
This statement is incorrect. Cellular respiration and photosynthesis involve different sets of enzymes due to the distinct biochemical pathways they utilize.
Step 2
B. An increase in pH above the optimal pH for cellular respiration may cause the enzymes to denature.
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This statement is correct. Enzymes have an optimal pH range, and deviations can lead to denaturation, affecting their function.
Step 3
C. The rates of these biochemical pathway reactions are not affected by changes in the concentrations of the enzymes.
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This statement is incorrect. The rate of reactions typically increases with higher concentrations of enzymes, following Michaelis-Menten kinetics.
Step 4
D. A decrease in temperature below the optimal temperature for photosynthesis will cause the enzymes to denature.
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Answer
This statement is also incorrect. While temperature does affect enzyme activity, a decrease typically slows down the reaction without causing denaturation, which usually occurs at excessively high temperatures.
